243021042 has 24 divisors (see below), whose sum is σ = 574413840. Its totient is φ = 73642680.

The previous prime is 243021041. The next prime is 243021043. The reversal of 243021042 is 240120342.

It is an interprime number because it is at equal distance from previous prime (243021041) and next prime (243021043).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (243021041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 613492 + ... + 613887.

It is an arithmetic number, because the mean of its divisors is an integer number (23933910).

Almost surely, 2^243021042 is an apocalyptic number.

243021042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

243021042 is an abundant number, since it is smaller than the sum of its proper divisors (331392798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243021042 is a wasteful number, since it uses less digits than its factorization.

243021042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227398 (or 1227395 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 243021042 is about 15589.1321759744. The cubic root of 243021042 is about 624.0431583808.

Adding to 243021042 its reverse (240120342), we get a palindrome (483141384).

The spelling of 243021042 in words is "two hundred forty-three million, twenty-one thousand, forty-two".